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The Evolutionarily Conserved Domain of Beclin 1 is Required for Vps34 Binding, Autophagy, and Tumor Suppressor Function
Open accessAbstract
Atg6/Beclin 1 is an evolutionarily conserved protein family that has been shown to function in vacuolar protein sorting (VPS) in yeast; in autophagy in yeast, Drosophila, Dictyostelium, C.elegans, and mammals; and in tumor suppression in mice. Atg6/Beclin 1 is thought to function as a VPS and autophagy protein as part of a complex with Class III phosphatidylinositol 3'-kinase (PI3K)/Vps34. However, nothing is known about which domains of Atg6/Beclin 1 are required for its functional activity and binding to Vps34. We hypothesized that the most highly conserved region of human Beclin 1 spanning from amino acids 244-337 is essential for Vps34 binding, autophagy, and tumor suppressor function. To investigate this hypothesis, we evaluated the effects of wild-type and mutant beclin 1 gene transfer in autophagy-deficient MCF7 human breast carcinoma cells. We found that, unlike wild-type Beclin 1, a Beclin 1 mutant lacking aa 244-337 (Beclin 1DeltaECD), is unable to enhance starvation-induced autophagy in low Beclin 1-expressing MCF7 human breast carcinoma cells. In contrast to wild-type Beclin 1, mutant Beclin 1DeltaECD is unable to immunoprecipitate Vps34, has no Beclin 1-associated Vps34 kinase activity, and lacks tumor suppressor function in an MCF7 scid mouse xenograft tumor model. The maturation of cathepsin D, which requires intact Vps34-dependent VPS function, is comparable in autophagy-deficient low-Beclin 1 expressing MCF7 cells, autophagy-deficient MCF7 cells transfected with Beclin 1DeltaECD, and autophagy-competent MCF7 cells transfected with wild-type Beclin 1. These findings identify an evolutionarily conserved domain of Beclin 1 that is essential for Vps34 interaction, autophagy function, and tumor suppressor function. Furthermore, they suggest a connection between Beclin 1-associated Class III PI3K/Vps34-dependent autophagy, but not VPS, function and the mechanism of Beclin 1 tumor suppressor action in human breast cancer cells.
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Metadata
- Authors
- Furuya, N., Yu, J., Byfield, M., Pattingre, S., & Levine, B.
- Venue
- Autophagy
- Publisher
- Informa UK Limited
- Published
- 2005-04-28
- Volume
- 1
- Issue
- 1
- Pages
- 46-52
- ISSN
- 1554-8627 (ISSN-L)
- 1554-8635
- OpenAlex
- W1986911872
- Cited by
- 429
- References
- 0
- FWCI
- 11.12
- Type
- journal article
- Language
- en
- Open access
- bronze
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